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Unread 04-24-2013, 04:22 PM   #1
DragNut
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4.7 headbolts

Some on this forum have stated that the headbolts from the 4.7 are not reusable, In my shop manual it states to check the bolts and make sure they are not stretched beyond spec and as long as they are not then they can be reused. Is this the fact?

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Unread 04-24-2013, 06:02 PM   #2
Red350ss
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Quote:
Originally Posted by DragNut View Post
Some on this forum have stated that the headbolts from the 4.7 are not reusable, In my shop manual it states to check the bolts and make sure they are not stretched beyond spec and as long as they are not then they can be reused. Is this the fact?
They may be reusable, but I have always replaced headbolts on anything I have pulled a head off of....cheap insurance to replace them, then ya know you are torqued correctly....
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Unread 04-24-2013, 06:55 PM   #3
WJ4x4LIFE
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Originally Posted by Red350ss View Post
They may be reusable, but I have always replaced headbolts on anything I have pulled a head off of....cheap insurance to replace them, then ya know you are torqued correctly....



They are usable as long as they are over spec, but anyone that rebuilds engine and/or has any real common mechanical skill and knows what they are doing, WILL agree to just replace a set of head bolts on each head/s and be done with. I am included in this group with just replacing them for cheap great insurance.

OEM

P/N: 06505528AA $4.35 (each) need x20 total for both heads.

P/N: 06506785AA $2.10 (each) need x8 total for both heads.

or

you can purchase aftermarket cylinder head bolts.
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Unread 04-25-2013, 04:41 PM   #4
berndog67
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its def a good idea not to reuse TTY bolts, but if one was to do so its obvious if u can or not, because if u can turn them in and out by hand then they are not stretched, i know on both 4.7's i rebuilt that most of the headbolts couldnt be turned out by hand, so they were obviously stretched, but the weird thing is somehow they measured within spec
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Unread 04-25-2013, 04:45 PM   #5
berndog67
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also if you have the heads off spend the extra $130ish to have them checked, because not all compression issues are just headgaskets, both of mine ended up having 3 outta round valves and needed 1.5 thousands taken off to get em flat, runs like a champ a yr later
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2003 WJ Overland, 4.7HO, D30 & D44A (1 tons going in now!), RC Long Arm, lifted 4" Front 6" Rear, RC 2.2 4" Shocks, JKS track bar, custom hi-steer, 35" Procomp M/T's on JK rims, beefed up Overland rock rails, custom skids and dif gaurds, Rugged Ridge 8500 synthetic winch in custom hidden mount
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